Dell, whose business is concentrated in the enterprise market, managed to hold on to its No. 2 ranking in the second quarter with a market share of 13.7 percent, but suffered a massive 17.1 percent year-on-year decline in shipments, IDC said.

But the Taiwanese company has Dell in its sights. While the US company saw market share slip 2.4 percentage points compared with a year ago, Acer expanded its slice of the market by 2.7 percentage points.

Acer “saw a significant gain in the US market, likely benefiting from the troubles of Dell and Lenovo,” IDC said in a statement.

Hewlett-Packard Co held onto the top spot among PC makers in the second quarter, showing year-on-year growth of 3.6 percent in shipments, for a market share just shy of 20 percent.

Lenovo Group Ltd (聯想) and Toshiba Corp kept their positions as No. 4 and 5 respectively, both showing positive growth.